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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2013

Ref CPI and Index Ratios for December 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series C-2013
    CUSIP NUMBER:                           912828BD1
    DATED DATE:                             July 15, 2003
    ORIGINAL ISSUE DATE:                    July 15, 2003
    ADDITIONAL ISSUE DATE:                  October 15, 2003
    MATURITY DATE:                          July 15, 2013
    Ref CPI on DATED DATE:                  183.66452
    TABLE FOR MONTH OF:                     December 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) August 2007                 207.917
    CPI-U (NSA) September 2007              208.490
    CPI-U (NSA) October 2007                208.936

    Month      Calendar Day    Year    Ref CPI       Index Ratio

    December        1          2007    208.49000       1.13517
    December        2          2007    208.50439       1.13525
    December        3          2007    208.51877       1.13532
    December        4          2007    208.53316       1.13540
    December        5          2007    208.54755       1.13548
    December        6          2007    208.56194       1.13556
    December        7          2007    208.57632       1.13564
    December        8          2007    208.59071       1.13572
    December        9          2007    208.60510       1.13579
    December        10         2007    208.61948       1.13587
    December        11         2007    208.63387       1.13595
    December        12         2007    208.64826       1.13603
    December        13         2007    208.66265       1.13611
    December        14         2007    208.67703       1.13619
    December        15         2007    208.69142       1.13626
    December        16         2007    208.70581       1.13634
    December        17         2007    208.72019       1.13642
    December        18         2007    208.73458       1.13650
    December        19         2007    208.74897       1.13658
    December        20         2007    208.76335       1.13666
    December        21         2007    208.77774       1.13673
    December        22         2007    208.79213       1.13681
    December        23         2007    208.80652       1.13689
    December        24         2007    208.82090       1.13697
    December        25         2007    208.83529       1.13705
    December        26         2007    208.84968       1.13713
    December        27         2007    208.86406       1.13720
    December        28         2007    208.87845       1.13728
    December        29         2007    208.89284       1.13736
    December        30         2007    208.90723       1.13744
    December        31         2007    208.92161       1.13752